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OCR J277 › Component 1 › 1.1 Systems Architecture
1.1.1 — Architecture of the CPU
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1.1 Systems Architecture — subtopics
1.1.1 CPU Architecture
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1.1.2 CPU Performance
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1.1.3 Embedded Systems
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OCR J277 › 1.1 Systems Architecture › 1.1.1
Architecture of the CPU
📖 Lesson notes ▶ Video ⊞ Slides 📝 Worksheet ✎ Quiz 🔑 Key terms
📖 Key concepts
The Fetch-Execute Cycle
The CPU continuously repeats the fetch-execute cycle to process instructions
Fetch → the PC holds the address of the next instruction; it is copied to the MAR
Decode → the CU interprets the instruction held in the CIR
Execute → the ALU carries out arithmetic or logical operations
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1.1.1 — Architecture of the CPU
14 mins · OCR J277 · Component 1
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Which register holds the address of the next instruction to be fetched?
A. Accumulator (ACC)
B. Program Counter (PC) ✓
C. Memory Data Register (MDR)
D. Current Instruction Register (CIR)
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Control Unit — directs operations of the processor
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Memory Address Register — holds the address to be accessed
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Program Counter — holds address of next instruction
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